1
40
2
-
Text
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<a href="http://doi.org/10.1002/ajpa.23302" target="_blank" rel="noreferrer noopener">http://doi.org/10.1002/ajpa.23302</a>
Pages
623–634
Issue
3
Volume
164
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Relative tooth size at birth in primates: Life history correlates.
Publisher
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American journal of physical anthropology
Date
A point or period of time associated with an event in the lifecycle of the resource
2017
2017-11
Subject
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*anthropoid; *dental; *growth; *odontogenesis; Animals; Anthropology; Deciduous/*anatomy & histology; Female; Maxilla/anatomy & histology; Molar/anatomy & histology; Newborn/*physiology; Odontogenesis/*physiology; Physical; Primates/*physiology; Tooth
Creator
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Smith Timothy D; Muchlinski Magdalena N; Bucher Wade R; Vinyard Christopher J; Bonar Christopher J; Evans Sian; Williams Lawrence E; DeLeon Valerie B
Description
An account of the resource
OBJECTIVES: Dental eruption schedules have been closely linked to life history variables. Here we examine a sample of 50 perinatal primates (28 species) to determine whether life history traits correlate with relative tooth size at birth. MATERIALS AND METHODS: Newborn primates were studied using serial histological sectioning. Volumes of deciduous premolars (dp(2) -dp(4) ), replacement teeth (if any), and permanent molars (M(1-2/3) ) of the upper jaw were measured and residuals from cranial length were calculated with least squares regressions to obtain relative dental volumes (RDVs). RESULTS: Relative dental volumes of deciduous or permanent teeth have an unclear relationship with relative neonatal mass in all primates. Relative palatal length (RPL), used as a proxy for midfacial size, is significantly, positively correlated with larger deciduous and permanent postcanine teeth. However, when strepsirrhines alone are examined, larger RPL is correlated with smaller RDV of permanent teeth. In the full sample, RDVs of deciduous premolars are significantly negatively correlated with relative gestation length (RGL), but have no clear relationship with relative weaning age. RDVs of molars lack a clear relationship with RGL; later weaning is associated with larger molar RDV, although correlations are not significant. When strepsirrhines alone are analyzed, clearer trends are present: longer gestations or later weaning are associated with smaller deciduous and larger permanent postcanine teeth (only gestational length correlations are significant). DISCUSSION: Our results indicate a broad trend that primates with the shortest RGLs precociously develop deciduous teeth; in strepsirrhines, the opposite trend is seen for permanent molars. Anthropoids delay growth of permanent teeth, while strepsirrhines with short RGLs are growing replacement teeth concurrently. A comparison of neonatal volumes with existing information on extent of cusp mineralization indicates that growth of tooth germs and cusp mineralization may be selected for independently.
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<a href="http://doi.org/10.1002/ajpa.23302" target="_blank" rel="noreferrer noopener">10.1002/ajpa.23302</a>
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Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
*anthropoid
*dental
*growth
*odontogenesis
2017
American journal of physical anthropology
Animals
Anthropology
Bonar Christopher J
Bucher Wade R
Deciduous/*anatomy & histology
DeLeon Valerie B
Evans Sian
Female
Maxilla/anatomy & histology
Molar/anatomy & histology
Muchlinski Magdalena N
Newborn/*physiology
Odontogenesis/*physiology
Physical
Primates/*physiology
Smith Timothy D
Tooth
Vinyard Christopher J
Williams Lawrence E
-
Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
URL Address
n/a
Rights
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
Pages
177-188
Issue
2
Volume
49
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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A New Reconstruction Of Multituberculate Endocranial Casts And Encephalization Quotient Of Kryptobaatar
Publisher
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Acta Palaeontologica Polonica
Date
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2004
2004-04
Subject
The topic of the resource
body mass; body-weight; brain; brain structure; cistern; encephalization quotient; endocasts; evolution; Kryptobaatar; Late Cretaceous; mammals; Mongolia; multituberculata; Paleontology; phylogeny; size; superior; tooth
Creator
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Kielan-Jaworowska Z; Lancaster T
Description
An account of the resource
Multituberculate and eutriconodontan endocasts differ from those of primitive therian mammals in their lack of visible midbrain exposure oil the dorsal side and in having a vermis-like triangular bulge (recognized herein as the cast of a large sinus-the superior cistern) inserted between the cerebral hemispheres. As the shape and proportions of multituberculate. eutriconodontan, and Cretaceous eutherian endocasts are otherwise similar, one might speculate that the multituberculate and eutriconodontan brains did not differ essentially from those of primitive eutherian and marsupial mammals, in which the midbrain is exposed dorsally. This conclusion might have important phylogenetic implications, as multituberculates and eutriconodontans may lay closer to the therians sensu strico, than hitherto believed. We describe an endocast of the Late Cretaceous multi tuberculate Kryptobaatar, which differs from those of other multituberculates (Ptilodus, Chulsan-baatar. and Nemegtbaatar) in having unusually long olfactory bulbs and the paraflocculi elongated transversely, rather than ball-shaped. We estimate the encephalization quotient (EQ) of Kryptobaatar, using: 1) Jerison's classical equation (1) based on estimation of endocranial volume and body mass-, 2) McDermott et al.'s derived body mass estimation equation (2) using upper molar lengths; and 3) estimation of body mass based on new equations (3a, 3b, 3c, and 3d(1-9)), which we propose, using measurements of the humerus, radius, ulna, femur and tibia. In both Jerison's method and a mean of out series of derived formulae, the EQ varies around 0.71, which is higher than estimated for other multituberculate mammals. It remains an open question whether the evolutionary success of Kryptobaatar (which was a dominant mammal during the ?early Campanian on the Gobi Desert and survived until the ?late Campanian) might have been related to its relatively high EQ and well developed sensorimotor adaptations, in particular olfaction and coordinated movements.
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n/a
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Journal Article or Conference Abstract Publication
2004
Acta Palaeontologica Polonica
body mass
body-weight
Brain
brain structure
cistern
encephalization quotient
endocasts
Evolution
Journal Article or Conference Abstract Publication
Kielan-Jaworowska Z
Kryptobaatar
Lancaster T
Late Cretaceous
Mammals
Mongolia
multituberculata
Paleontology
Phylogeny
size
superior
Tooth